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Alveolar oxygen and carbon dioxide concentrations during simulated breathing through a T‐pieceEffect of breathing pattern, fresh gas flow, and reservoir volume

 

作者: DAVID GURA,   LAWRENCE SAIDMAN,  

 

期刊: Critical Care Medicine  (OVID Available online 1974)
卷期: Volume 2, issue 1  

页码: 11-22

 

ISSN:0090-3493

 

年代: 1974

 

出版商: OVID

 

数据来源: OVID

 

摘要:

Using a model to simulate a patient breathing spontaneously through a T-piece from a Puritan nebulizer delivering 44, 74 or 100% oxygen, we evaluated the effects of oxygen flow, ventilatory pattern, and open-ended reservoir (“tail-piece”) volume, on FAO2and FACO2.The FAO2approaches Fio2. with higher oxygen flows into the nebulizer, lower tidal volumes, lower respiratory flow rates, or larger reservoirs. However, with shallow rapid respiration a greater reservoir volume increases FACO2as well. Most importantly, when the nebulizer setting is changed from 40 to 70% or from 70 to 100%, only a negligible increase in FAO2is achieved at an oxygen flow of 5 L/min without the use of a reservoir. We conclude that the T-piece is most safely used with a Puritan nebulizer when the oxygen flow is set at 14L/min (Flush), and the reservoir volume is at least 200 ml.

 

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